"is a validating xml editor that runs in every DOM-conform browser (Mozilla, Netscape6 and MSIE5+). On the client sie it works with JavaScript and CSS, at the server side are some [Java] servlets for parsing the DTD and transforming the xml data via XSLT." Interesting. I'm not sure why, with all their whiz-bang JavaScript tomfoolery, they didn't use onmouseover layers to display element controls. I also wonder where they manage to fit all the possible child elements for any given DocBook element in that tiny little sidebar. Interesting all the same.